replacement stock inectors

[gtmerk]

I just tore into this gt finally and it runs like hell. I am running it out of a plastic tank( stock was really bad) with someones old FI swap. I pulled the injection out, and one is blowing all pressure off with every pulse.

So my q is, Is there any other stock models; manza cavalier etc, that run bigger injectors, slap right in kinda thing??

Im sure ill have more q's along the way.

I am gonna run through the ignition system soon as well.

Also, if someone has a schematic on the stock 75,(Ithink) injection setup, that would be great.

Take care

[baz]

i think the jag V12 with injection has the same ones , dont think the HE engine is the same i think they changed for them , the ones i have look a little different and i have 12 of them sitting doing nothing
i posted a list of Bosch injectors a couple of years back , have a search for it , it gives the #'s and flow rates and lots of info cars they are fitted too

[soybean]

Also, if someone has a schematic on the stock 75,(Ithink) injection setup, that would be great.

Take care

There was one in the tech section Here, but it appears to be gone. It might have gotten lost in the last upgrade. If you can't find one, let me know and I'll hunt it up and I'll re-upload it again. Jarrell

Check Here. I think this is what you are looking for.

[Gary]

There was one in the tech section Here, but it appears to be gone. It might have gotten lost in the last upgrade.

Ah yes, the whole tech section needs repair. The info is there but the links got messed up during an upgrade.

[RallyBob]

So my q is, Is there any other stock models; manza cavalier etc, that run bigger injectors, slap right in kinda thing??

You'll just want to find stock replacements, larger injectors will only make the engine run pig-rich, as the ECU is analog and is untuneable. More is not better in this case! Besides, the stock injectors can flow enough fuel for almost double the stock engine's rated HP.

Bob

[tekenaar]

I just tore into this gt finally and it runs like hell. I am running it out of a plastic tank( stock was really bad) with someones old FI swap. I pulled the injection out, and one is blowing all pressure off with every pulse.

So my q is, Is there any other stock models; manza cavalier etc, that run bigger injectors, slap right in kinda thing??

Im sure ill have more q's along the way.

I am gonna run through the ignition system soon as well.

Also, if someone has a schematic on the stock 75,(Ithink) injection setup, that would be great.

Take care

Everything you need for '75 (and later) FI in a GT.

[gtmerk]

What about the corvair or manza, le mans?? or the cavalier? arent they all opels?? or are the fuel injectors not standard?

Thanks

[kwilford]

What about the corvair or manza, le mans?? or the cavalier? arent they all opels?? or are the fuel injectors not standard?

Thanks

No. No. And no. Yes. The OEM injector is a Bosch, part # 280-150-105, and the only direct cross references I have ever found are:
Alfa Romeo v6-2.5l, v6-3.0l, (not sure of years)
'80-'83 Jaguar XJS,
'75 Opel 4-1.9l,
'76 Porsche 912E 4-2.0l,
75-77 Renault R17 4-1.6l,
'87-'88 Range Rover v8-3.5l,
Triumph 2.0l, v8-3.5l, (not sure of years)
'75 Nissan 280z (unsure if true)

[gtmerk]

We'll find out here in an hour or so then. I have a 280- sittin at the folks

The sad thing is it was there all the long.

Thanks again

[gtmerk]

Yes, the z injectors will work, but the spray pattern is a bit different than the three good ones i have, which all seemed pretty equal. Would this effect much?

putting 4 matched z injectors in that is.

[kwilford]

Yes, the z injectors will work, but the spray pattern is a bit different than the three good ones i have, which all seemed pretty equal. Would this effect much?

putting 4 matched z injectors in that is.

What part number are the Z injectors? I have done a BUNCH of searching for cross references for these injectors, and while virtually every other model showed up numerous times, the '75 280Z only showed up in one reference. If the specs are the same or similar, ESPECIALLY the impedance (resistance, but for an inductive device), they should be fine. I have a couple of spec sheets on Bosch injectors, and the critical elements (2 to 3 ohms (low) resistance, 187 to 192 cc per minute or 18.1 lbs/hr, 43.5 psi operating pressure, etc) are quite similar over a range of part numbers, but I suspect that the connectors and mounting may vary.

Another useful reference number is "FJ3", as it refers to an aftermarket rebuilt injector that is the same as the Bosch.

HTH

[gtmerk]

So I finally found my first pitfall wasnt even injectors at all. it was the fact that my ecu is under two layers of carpet in some green slimish substance on the pass side firewall/footwell.

After drying in the sun, and realizing the pin closest to pivot point(a throttle body wire?) is pushed in and bent.

got it *fixed* and its actually running for more than 2-3sec.

but needs a mean tuning. any suggestions for a overall tune? Maybe a hint on how to see timing marks through intake to start??

maybe z injectors will run rich?? anyone know? it is *running though.

[davegt27]

a few things

you need the factory FI book or if you can get it or have someone make a copy for you

How to tune and Modify Bosch FI is also helpful


my suggestions if you want to tune this L-jet system it needs to be in good working order

one way to tell (its in good working order) is if you can get it to idle down to the mim rpm the book calls out (its like 500 to 800 rpm i forget been a long time ago)

now if its working properly (mechanically sound) you now need the make the system ADJ

that means you need some type of AFR meter (wide band or narrow band --wide band is better but i use narrow band)

the next thing is you need an ADJ fuel pressure regulator

I have found that fuel pressure was higher then what the book called out
i had 42 psi

basically how this stuff works is there is an optimal AFR (air fuel ratio) for fuel economy and another for best performance

if the car is rich (to much fuel to be optimal) then you have two options
you could add air or reduce the amount of fuel the motor is getting

if the car is running lean the you go the other way

adding fuel is easy and most people make this mistake

the hard part is getting more air through the motor

so to recap

steps

1) find out where you are at
2) get it the best you can before you modify
3) make the system ADJ
4) ADJ to your goals but always have the ability to return to the original
settings (that might mean having an extra Air Flow meter)


HTH
Davegt27